HOW to use ssh_channel_write multi times

["=?gb18030?b?wfXUqtXc?=" <945695107@xxxxxx>]

Hi
I want to implement channel_exec_request_function, which capture the display and write back to client.
the code:
while (fgets(buffer, sizeof(buffer), fp) != NULL) {
       ssh_channel_write(chan, buffer, strlen(buffer));
       memset(buffer, 0, sizeof(buffer));
}

Since there maybe many outputs, so I want to send it one line each time.
Here only the first write success, then all failed with return value -1.
I wonder does this mean I can write ONLY 1 line in this function? no matter how much data, the libssh will handle it?
Or I miss something?


Thanks,
Yuanzhe